Pryor via late stoppage. Although, he'd have to incorporate some of his skills, and even some clinching in this one. Straight up non-stop brawling with Mike, and Aaron very well could have gotten KO'd. But Pryor wasnt a dumb fighter. He'd do what he'd have to, and in the end overwhelm Tyson.
12 would suffice. I think he'd stop him in 11. Mike would be still on his feet, but Pryor would be raining it on him and the ref would jump in, ala Tyson-Holy 1.
I actually think that Tyson stops him. Tyson had better defense, better power & was extremely accurate. Pryor brawls, gets caught too often & TKO'ed
Of the two guys who feasted on weak competition before gaining top honors by beating an older, smaller opponent, Tyson is better.